Machine for expanding sheet metal.



Y, VBamm.

MACHINE FOR BXPANmNG SHEET METAL.

Patented Mr.24,1`914.

7 SHEETS-SHEET 1 APrLIoATIoN FILED 00T. 7, 1912.

C. AREY.

MACHINE POR. EXPANDING SHEET METAL.

mmm Mai. 24,' 1914;

7 SHEETS-SHEET 2..

a APPLICATION FILED OCT. 7, 1912.

/ W6-@ff f F.G;ARB; 1 MACHINE FOR EXPANDING SHEET METAL. APPLICATION FILED OCT. 7A 1912 v l LQQQL Patented Mar.24,1914

7 'SHEETS-SHEET s.

FQG.AREYn MACHINE FOR EXPANDING SHEET METAL.

APPLIOATION FILED oww/,1912. I l

` Patented Mar. 24, 1914 7 SHEETS-SHEET 4.

l I'. C. AREY. MACHINE FOR EXPANDING SHBBT METAL.

' APPLOATION FILED 00T. 7, 15112;

Patented Mar.24,1914

` 7 SHEETS-SHEET 5.

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ARopARBY..V l MACHINE FOR EXPANDING SHEET METAL.-

7SHEETS4SHEET 6.4

F. G. mmf, MACHINE POR EXPANDING SHEET METAL,

APPLICATION FILED 0012x1912. j L 1 n 1 famme@ Mali 2%, 9%.

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: rrnn erarne narra A prision'.

FRED C. AREY, OF OAK PARK, ILLINOIS, ASSIG'NOR TO NORTHWESTERN EXPANDE METAL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

" MACHINE FOR EXFANDING' SHEET METAL.

Application filed october 7 which it pertains to make and use the same,

reference being had to the accompanying drawings, which form a part of'this specification.

My invention relates to machines for expanding sheet metal and more particularly to the type disclosed in Patent 917,715 issued Aprile, 1909.

It has for its object to improve the construction of such machines so as to make them capable of performing their work better than heretofore, provide for convenient and accurate adjustment and insure stability. j

rIhe various features of novelty whereby my invention is characterized will hereinafter be pointed out with particularity in the claims; but for a full understandingof Amy invention and of its object and advantages, reference may be had to the following 'detailed description taken in connection with the accompanying drawings wherein:

l'Figure 1 is a side elevation of a machine arranged in accordance with a preferred embodiment of my invention; Fig. 2 is an end view of the machine,looking toward the left in Fig. 1; Fig. 3 isa top plan view; Fig. e is a view on an enlarged scale taken approximately on the plane indicated by line 4 4 of Fig. 1,`the expander' arms and some of the gearing being omitted; Fig. 5 is .a section taken approximately on line 5-5 of Fig.. d;

Fig. 6 is a section taken approximately on.

line G-G of Fig. 4; Fig. 7 is a view corre spending to Fig. 2, being on an enlarged scale and showing less of the machine than is `illustrated in Fig. EZ; Fig. 8 is a longitudinal vertical section taken just outside of the lower expander arm and illustrating the means for supporting the lower end of this arm; Fig. 9 is a longitudinal vertical section'thiougli the parts shown in the lower' half of Fig. S; Fig. 10 is a plan view of the angular' plate shown in Figs. 8 and 9; Fig. 11 is a section taken approximately on line 11-'11 of Fig. 9; Fig. 12 is a vertical longiporting parts therefor; Fig. 13

Specification of Letters Patent. Patented llllair. 2d, 1914.

,1912. serial No. 724,293.

tudinal section through the lower end of the lower expander' arm and the immediate sup-I is a view looking toward the right vin Fig. 1Q, with the expander arm omitted; Fig. 14 is a side elevation of a portion of the supporting means for the upper end of the upper expander arm; and Fig. 15 is a. view looking towar.r the lett in Fig. 14.

The machine which l have illustrated is the same as that illustrated in the patent to which I have heretofore referred except as to the means for supporting and adjusting the expand er arms; my invention being eoncerned only with means for more rigidly supporting the expander arms and per-mitting them to be adjusted accurately in various ways without danger that they will easily get out of place. For the sake of brevity, therefore, l shall confine the de tailed description, as far as possible, to my are pivotally mounted and their oppositeends are adjustably supported upon arms or risersA projecting upwardly from the frame. rlhe duty of machines of this kind is ex tremely heavy and therefore simple arms or risers will not give rigidity 'to the expander arms but will allow them Vto vibrate, thus keeping down the eiliciency of themmachine and making it necessary to give them con4 siderable attention to keep them iu. proper working order.

@ne of the features of my inventionV consists in improved supporting means which i will permit the angle between the expander arms toIbe varied and adjusted to a ninety and which will al vays hold the expander arms rigid. itv is also desirable 'to make it possible to adjust the expander arms laterally with respect to a longitudinal verti cal plane, and therefore my invention also contemplates a novel arangement for ldd ' 30 of the expander arms .from and towardeach izo Curingadjustmeae of this 'kine which win Ainsure'p'roper alinement in a longitudinal direction when the adjustments are made andwill lalso insure that this alinement will be maintained during. the subsequent opera-- tion of the machine. I have found that it is desirable to be ableto'raise and lower vthe receiving ends of thel expander arms -because it is diic'ult to determine 1n advance just how the receiving. ends of the expander arms should be set and even after they have-been set in the `best positions for one kind of work, as to size ormateriahit mayl be better to raise or lower them some-v ywhat vfor anotherkind' of work.- To illustrate'h/Iachinesl of this kind' are adapted. to expand a slitted sheet metal *strip so as-` to transform it into a shorter andunuch wider str-ip composedrof numerous diamondshaped cellular members. In the process of expanding, the side portions of the strip are firmly held between thechains on theexpander arms and -are prevented from shortenin while the central portion is be ing lexpa ide'd and shortened. This has the effect -of making the advance end of the fin y ished strip concave and the opposite end convex, the degree of concavity and oon.

vexity depending upon conditions. I have found that by shiftingthe receiving ends other, in the vertical directions,.`a change in the degree of convexity and concavity-'of the ends of the completed strip,re'sults, `there being always some particularl relative posi-y tion of the-receivingjends of the expander. arms which .will c'ausve -the`expanded 'strip' to1 have substantially straight ends."l This is for the reason that the proportionbe- 'tween the length and the width of the diamond shaped cells, 'and the" relation between these' proportions in cellsalong the middleof the strip-and tthose' nearer the sides, varies according to the .difference in-vertical elevation between the rcceivlng ends of the expander arms for any given degreeof .expansion of a strip 'in the lateral direction.

Furthermore, such a 'relative' adjustment of the expander arms increases the capacity of the machine in that ,it permits a wider strip to be handledthan would otherwise beI pose arms, this construction being best shown in l ce.

Figs."l and `3 to ,6 inclusive. 'In the arrangement shown, there is mounted on top #of the pedestal, 3, an auxiliary pedestal, 6,

on whichis j ournaled one of the transverse y'power shafts, 7. The member 6 has depending aprons o r flanges, 8 and 9, LVbearing against the rear face of the main pedestal,

\ each of these aprons or flanges being proyided- -1n thev rear face .with a transverse groove, 10. Resting against the flanges or aprons, 8 and 9, are flat plates, 11 and 12,

.respectively,each having a tonguev or rib, '13 fitting slidablylwithin the corresponding groove, 10, thus permitting thesetwol plates -to "be moved laterally without changing ,their relations'infa vertical direction with respect to the grooved members,f8 and V9.

The rmembers 1 1 and l2 are provided. on

'their rearA facesv with vertical ribs or "projections,.14. Behind and bearing against" the plates 11 and 12 are brackets, 16 and 17,

-each having in" its -front face a' vertical groove,` l18,' adapted `to receive the corre-mA sponding rib or'-projection 1 4v 'so that each bracket may be shifted v 'erticall'y on the platebetween itand 'the pedestal and may -alsobe shifted laterally with thefplate, the.

,two sets of'ribs and grooves'arrangedat adjustment to be yeffected vwithout`regard to the other. .In the arrangement shown, I

vvhav'evemployed two sets` of bolts Leach of 'right'angles'to each other, permitting either ,v

which secures together one-ofthe brackets, y the. auxiliary pedestaltvand the intervening plate and at the same time secures the aux-v iliary pedestal to the main pedestal.: -20and 21' being bolts which pass through verti- 'cally-elongated slots, 22, in thebraoket, 16',

throughhorizontally-elongated slots,`23, in

the'plate, 11, andl through 1round holes lin the. auxiliary pedestal, the bolt, 20, passingv through theflange orl apron, 8, ofthe auX- iliary pedestal and through the wall ofthe 'main pedestal, while the bolt 2-1 `simpl-y passes through the wall of the Aauxiliary pedestalat a point above the main pedestal.;

-`and 'the bolts 24 and 25 passing through vertically-elongated slots, 26, in the bracket,-

17, 'through horizontallyclongated slots, 27,

in the plate 12, the bolt 24 also'passing through 'registering round holes 'in 4the apron 9 and in the rear wall of the main f pedestal, while the bolt'25 simply passes through a round hole in the auxiliary ped. i

estal. Secured onl the back lof the main pedestalv beneath each of' the bracketslG 'and 17, is

a block, 28, and through Aeach of4 these blocks ,extends a set screw, 29, which engages with the bottom. edge ofthe overlying bracket.

The plates 1 1 ,and 12 are each provided with a horizontally screw-threaded bore, 30, eX# tending inwardly through the outer side"y f "edge thereof and vinto these bores extend.'

screw-threaded shafts, 31 .and 32.

The shafts 31'and 32 are revolubly supported in bearings, 33, carriedmby the main pedestal and are provided onift their outer ends with bevel gear wheels, 34, fixed thereto.

The

gear wheels serve as collars to prevent the i shafts fromy moving'axially in one direc-- 'interfering with the lateral adjustment.

Similarly a lateral adjustment of either of the brackets may be obtained by turning the bevel gear on the screw shaft connected With it, without interfering with the vertical adjustment.

Each of the brackets, v1G and 17, has at its upper end a suitable bearing, 37, in which the supporting shaft for the receiving end of one of the expander arms is journaled, these shafts being indicated at 38 and 39, respectively, in Fig. t. It Will thus be seen that by means of the set screws, 29, and the screw shafts, 3l and 32, any desired adjustment of the receiving ends, of the expander arms maybe etfected,.either being capable of being adjusted both .laterally and vertically regardless of the other; and, Whenever an adjustment has been effected, absolute rigidity of support is ob tained by simply tightening the nuts on the several bolts.

ll shall new describe the means for supporting the rear end or loiver end of the loi'ver expander arm, 5. frame, just below the rear end of the lower arm lies a plate, 4:0, having on its under face a transverse rib, Lil, Which i'its in a transverse groove, -Ll-Q, in the top of 'the base. Bolts, 43, pass down through laterally-elongated slots, #lf-l, in the plate, d0, and into or through some portion of the stationary base; this arrangement permitting the member 1l() to be adjusted laterally of the machine Without interfering with its adjustment in a longitudinal direct-ion. The member el() has aforu'ardly and downwardly in* clined part, 45, which is provided on its upper face ivith a groove, 46, which, viewed from above, extends longitudinally ofthe machine. @n the member l5 rests a block, f-l-T, having on its under face a rib or pro jeclion, t3, fitting into the groove, 46. The block is adjustably held in place by means ot bolts, 49, which pass dovvn through the block and through slots,.50, in the member elongated in directions parallel with the groove ed. @n the front end of the member is a set screw, 5 1, which engages with the front end of the' block, 47, and serves to adjust the block upwardly along the mem-- ber and to prevent it from dropping back before the nuts on the bolts 49 can be tight- @n the j' block, lit-7 is arranged l a @n the base of the bracket, 52, the bracket having a pair of ears, 53, lying on opposite sides of the block, and a bolt, 54, extends through these ears and through the block; the bracket being therefore mounted on the block by means of a. hinge. As will best be seen from Figs. S and 1:2, the bracket, 52, has an upper curved bearing seat, 55, upon which rests a curved shoe or part, 56, on the end of the expander arm, -The bearing seat, 55, may be provided with a groove, 57, arranged in a plane at right angles to the axis of the 'bolt or shaft, 54, and the member 56 may have a rib or projection, 58, adapted to fit into this groove and thus hold the end of -the expander arm against lateral movement on the bracket. rthe bracket is also provided with an arm, 59,`projecting upwardly at the outer side at some distance from the expander arm and has on its upper end a journal bearing, v60, col-axial with the jeun nal bearing, (il, in the expander arm poiver shaft, 63, extends through the journal bearing in the bracket and the bearing in the expander arm for the purpose of transmitting power to the usual chains on the expander arm. @n the shaft, @3, are the usual sprocket Wheels, and gear Wheels, h5, the sprocket ivheel being driven bv a suitable chain, GU, passing over a sprocket wheel, (3T, o n the power shaft, 7; and the gear Wheel, '35, actuating the gear wheel, G3., `in the usual way, for transmitting power to the chain in the upper half of the expander arm. rilhe expander arm may be held rigidly upon the bracket by means of a bolt, G2, passing through the latter and through an elongated slot, (39, in the member 56, this bolt being loosened 7when a vertical adjustment of the lower end of the lower expander arm is to be made.

rlhe adjust-able plate, all), has extending into ity through its outer side edge, a screw# threaded bore, T0, into which projects a screw-threzulelil shaft, 7l, ivhose outer end has a bearing in a bracket, 72., secured upon the base of the machine, as bestl seen in Figs. l and 2. .Fixed to the shaft, 7l, is a bevel gear wheel, T3; the shaft 7l and gear Wheel 73 being similar to the shaft 3l and the gear wheel 34 at the front end of the expander arm (ln the sha-ft 3l -is .supported an arm, Tel, having in its free end a journal bearing, T5. @n theshaft, Tl, is supported an arm or yoke, 7G, having in its free end a journal bearing, T7. "Z3 is a shaf iyhich extends alongr the side of theinachine through the journal bearings 75 and 7T, and is provided at its ends with bevel. pinions, 79 and SO, which mesh respectively vviththe bevel gear, 3d, and the bevel gear 73. Between lthe ends ot' the shaft is tixed a hand Wheel, 8l, by which the shaft' may be turned. lt will be seen that when the bolts, ft-3, which hold the supporting plate, 4.0, upon thebase, are

lll 0 i loosened, .and the shaft, `78, is turned, thel plate and the end of the expander' arm carriedzthereby will be shifted; transversely;

this samemovementof the shaft, 78, will' also 'turn the gear wheel, Bit, producing an adjustment of the' front end of the expander v arm,-o." It will'- thus be seen that by properly proportioning the parts, the entire lower expander, arm may bemoved in or outrelative' to the centra-l longitudinal axis of the machine without changmgithe angle ofany of itsparts with'respect to ,such

longitudinalaxis. ,In other words,-any line g vonfthe lexpander arm Whichfis at onetime parallel-with a vertical plane containing the longitudinal axis ofthe machine always'remains parallel to that plane regardless of 'its distance therefrom. ThisV arrangement permits the expander 4arm to be adjusted transversely, quickly and lconveniently with the assurance that -.the alinernent 1n the vlongitudinal direction will always be correctxand` it also .insures thatv neither endof the.'ex'pander arm can shift laterally without a' corresponding movement on the part of the other-arm.l It will also be seen 'that by shifting the supporting block, 47', on the member 15', the ,outer endof thelowerv expander arm may be raised or lowered so as to vary the degree of divergence between the two' expander arms. i l

Themeans forv supporting' the rear end of the upper' expander arm, 4, is best illustrated in Figs. 2, 7, l14s andl. Referring to theseigures, 85 is a plate formed Yon or secured ontop of the baseof the machine below the, rear end of the upper expander arm. v In the upper surface of this plate is atransversegroove, 86. On the plate rests a bracket, 87 having '1 an elongated rib. or projection, `88, fitting -i'n'to4 the groove, 86.

` Thebracketis secured inplace by means of u Y bolts,l 89,A which pass'down'lthrough laterl1-ally-'elonga ted,.slots," 90, .in the bracket,

throughl the'plate, 85, and into or'through apart of the'base.' `Secured on the front facexofithe bracket by means of bolts, 91,

i passing' through vertically-elongated slots,

9 2, in the bracket is a member, 93. The bracket and the member 93 -are provided 4with vforwardly-prejecting ears, 951 and 95, respectively, lying one below the other and a set screw, 96, passing through the ear, 94,`

and engaging withl the under sideof the 'ear 95,. serves to move the member 93 up or permit it to drop down 'when thelbolts, 91, are loosened. The member 93 may therefor'ebe adjusted in a vertical direction-onl the .bracket and, may be adjusted laterally with the bracket, The rearend ofthe upper vexpander arm 'is secured'to anoverlying part, 101, of a heavy rigid uprightA member,

100; the lo ver end of the' upright member being provided vwith downwardly-project-` ing ears, `102, which lie at opposite sides of the member, 93, and aresecured lthereto by -me'ans'of a heavy bolt, 103,1passing'through the ears and the member, 93 ;y tliemember 93 being made comparatively wide Iso thattheheavy upright is rigidly supported except .in so -far as angular movements around the axis ofV the heavy. bolt 103,'are concerned; The overhanging part, 101, of the upright is preferably provided on its underside' Y withl a concave seat, 104,- into whichl fits a convex part, 105,. at the'upper rear corner of the "upper expander arm.; the expander arm being held securely in the seatby no eans -of bolts, 106, passing down through elongated slots, 107 into the expander-arm.v Lateral movement of the expander arm` on the Aupright maybe effectively prevented by providinga tongue and groove connect-ion, 108, between the same, the tongue and groove extending at right angles to the axis of curvature of the vbearing surface between the upright 'and the expander arm; this axis of curvature corresponding with the axis of the power shaft', 109, which drives the usual chain* in the -upper half of this expander arm and consequently this po-wer's'haft may conveniently be -journaled in a compara- ,tively long bearing, 110, in the uprightl' By threaded bo're, 115, extending ,laterally intolo the lsame through its outer side edge and into this bore extendsa shaft, 116, carrying a bevel gear wheel, 117, the outer.A end 'of the shaft being supported in a stationary bracket, 118.- The parts, 4116 tos118may be identical with the parts 71 to 73 and therethe arm or yoke, 76, `on the shaft 71. Similarly, on the shaft 32 which serves to adjust the front end of the upper expander arm in a transverse direction 1s an arm, 120, corresponding to the arm 79 on the opposite side ofthe machine.y 121 represents a shaft extending lengthwise ofthe machine and journaled in the' members 119 and 120 and havfore require no further explahation. On the l shaft 1 16 isan arm or yoke, 119, similar-to ing at its ends bevel pinions meshing'with the bevel gear wheels 34 and 117. Tl-ie shaft 1121 may also be lprovided with a hand,

wheel, 122, by which it may be turned.' It

'willthus be'seenthatby, loosening the bolts,

89, at the rear end of .the expander arm, and the bolts, 24 and 25, at the front end, the upper expander arm as a whole may be adjusted in -and .out relative tothe longitudiaccessi nal axis of the machine, by simply turning the hand wheel 122; the adjustments being` Y exactl f the saine as the corres ondiiio' ad- 'When it is desired to raise or lower the rear end of the upper expander arm, the bolts 91 are loosened and the set screw 96 is turned in the proper direction so as to raise or lower the supporting member 93. Since this adjustment changes the angular relation between the upright and the upper expander arm, the fastening bolts, 10G, between the' upright should be loosened at the tiniethis adjustmenty is made and should again be tightened after the adjustment is complete.

lWhile -I -have illustrated and described only a single preferred embodiment of my invention, I do not desire to be limited to the exact structural details thus illustrated and described; but intend to cover all forms and arrangements which come Within the terms employed in the denitions ofmy invention constituting the appended claims.

I claim:

1. Iii-a machine of the character described', a guide for sheets to'he expanded, expander arms diverging from a point adjacent to the delivery end of the guide,'and means for bodily adjusting the expander arms at the ends adjacent'to the guidel transversely' to the plane of aA sheet in the guide. j 2; In a machine of the character described,l expander arms arranged 4on opposite sides of a horizontal planeand diver ing from- 'one end toward the other, -and means for adjusting the ends of the arms nearest each -`other transversely of said plane.

3. In a machine of the characterdescribed,

. .expander arms arrangedon opposite sides `vertical plane.

of a vcrtiealplane and diverging from each other on opposite sides of a `horizontal plane, and means for simultaneously adjusting bothends of one of said arms relative to said 4. In a machine of the character described,4 expander arms arranged on opposite sides of a vertical plane'and diverging from each other on opposite sides of a horizontal plane,

and means forA simultaneously .adjusting bothends of either of said` arms relative to said vertical plane. 5. In a machine of the character described,l

'1 expander arms arranged on opposite sides of a vertical plane and diverging from each other on opposite sides of a horizontal plane, and means for adjusting both ends of each of said arms bodily 'in directions transverse to each of said planes.

6l In amachine of the character described, expander. armsdiverging from each other on opposite sides of a horizontal plane, and

can

means for adjusting either end. of either of said arms bodily from and toward said` plane. y

7. In a machine of the character described,l

said arms in directions transverseto said horizontal planes and means for simultaneously adjusting both ends of either of said arms transversely to a vertical plane.

8. In a machine of the character described, a frame, diverging expander arms, a member mounted on the frame at each end of each of said expander arms in such a manner as to be 'adjustable bodily in two directions at. right angles to each otheigand conneetionsbetween said expander arms and said members to vpermit relative angular movements between the same about horizontal-axes.

' 9. In a machine of the character described, a frame, diverging expander arms, a member mounted on said frame at each end of each of saidexpander arms so as to be adjustable laterallyin a horizontaldirection members, and and operating mechanism be tween the two members ,supporting each exjusted simultaneously in said horizontal direction.l j

10. In a machine of-fthe character'described,A a frame, verticallyediverging expander arms above the frame, means for supporting on the frame the ends ofthe arms nearest each.' other, a fconnection between the frame and the remaining' en d of the lower arm, abracket on the frame, an'up:

right extending' from the bracket and' pro' jecting laterally across the top of thefremaining end of the 'upper arm, and means for rigidly securing the upper arm to .-the overlying portion of said upright.

ll1. In a machinev of -the character de scribed, a`frame, vertically-diverging ex-l pander-arms above 'the frame, means for pivotally supporting on the frame theA ends' of the. arms nearest `each other, an adjustable connection between the frame and the remaining end ofthe lower arm, a bracketon the frame beneath the. upper arm, a part vertically-adjustable on said bracket, an up- 'paii'der arm for permitting them to be ad-v Y I ire right hinged to said part," and extending upward .in proximity to the upper end of the upper arm, and means for rigidly securing the upper arm tothe adjacent portion of said upright.

12. In amachine of. the character described, a frame, vertically-diverging" exf pander arms abovegtheframe, means for piyotallysupporting ori-the framethe ends -of the arms nearest each other, an adjustable connection between the frame and .the

h remaining end of thelowerarm, a bracket on the frame beneath the upper arm, a part `vertically-adjustable on saidbracket, an up` right hinged lto said part and Vhaving a part projecting laterally above the remaining-endV of the upper arm, and means for rigidly securing' the upper arm to the overlying portion ofthe upright.

13. In a `machine of the character `de scribed, a frame, vertically-diverging expander arms above the frame, means for pivotally supporting -on the [frame the end's 4 of the arms nearest each-other, an adjustablev connection between thel frame and the4 remaining end of the lower arm, a bracket on the` frame beneath the upper arm, a' part` 7 'of the arms nearesteach other, an adjustable connection between the frame and the 'remaining 'end of the lower arm, ia bracket on the frame beneath the upper arm,`said .bracket having a wide vertically-adjustable part', an upright having on its lower end ears lying on .opposite sides of a member projecting laterally above the remaining end of the upper arm, means `for. rigidly securingA the upper arm Vto the overlying portion of the upright, and a bolt passing through said ears and said part. l' Y 15. In a machine' of the character le-- scribed,'a frame, diverging expander arms,'a member mounted on said frame at eachend lof each of said expander arms so as to be adj-ustable laterally in a horizontal direction,

- means for supporting the ends of the expander arms on the adjacent members, a

.screw shaftbetween each of said members and the frame, and mechanism between the two shafts connected with the members supporting eachexpander arm for simultaneously turning the shafts associated with either arm'so as to` adjust eitherarm bodily.

16. In a machine of the character de#` scribed, a frame, diverging expander arms above the frame, supporting brackets for the 'the frame.

endsof each of said arms,each supporting bracket having a widebearingfsurface on the lframe, and means for adjusting said brackets on the frame.

17. In a machine of thecharacter described a frame, vertically-'diverging ex- 'pander arms above the frame, means .for 4supporting the ends of the arms nearest each other on the frame, a connection between the frame and the remaining end ofthe lowerl arm,l a bracket having a wide bearing surface on the frame, means for adjusting said bracket laterally along the frame, and a heavy upright extending upwardly from the bracket and rigidly secured at its upper end to the'remaining end of the upper arm`.A

,18; In a machinel of thecharacter described, a frame, verticallydiverging expander arms above the trama-means for pivotally supporting on the frame' the ends of the arms nearest each other, an Vadjustable connection between the frame andthe I remaining end of the lower arm, agbracket on the frame below the upper end of the upper arm, a partvertically adjust-able on said bracket, an vupright hinged to said-part land extending -in proximity to the upper end of the'upper arm, said upright having a broad transverse-bearing surface, and means for rigidly-holding the upper end of the upper arm against said bearing surface.-

v 19. In a. machine of the character described, a frame, vertically-diverging expander arms above the frame, means for support-ing on the frame the ends of the armsnearest each other, a connection between'the' frame and the remaining end vof tlie'lower arm, an upright extending from theupper end of the upper arm into yproximity tosaid frame, said upright having a 'long base measured -in a direction transverse to. the frame, means for connecting saidbase to the frame,lmeans for rigidly connecting the upper end of the upright to the adjacent end of the upper arm, said upright being in the form of a deep beam having its greater cross dimension extending transversely `oi? f In testimony whereof, I-sign this specification in the presenoe'of two witnesses.

FRED o. AREY.

Witnesses: WM. F. -Fir JDENREICH, RUTH E. ZETTENALL. 

